Recently, most of the offshore wind turbines are mounted on the various foundations based on the range of water depth.
And it is beneficial for further study on semi-submersible FOWTs. The results can provide a clear understanding of the effects of uniform wind and dynamic wind on a Semi FOWT. In addition, in order to validate the feasibility and safety of the mooring system with redundancy design, the influences of mooring line failure and resulting changes to the platform performances are investigated. The effects of uniform and dynamic winds on platform motions, effective tension of mooring system, blade deformation and force on tower are analyzed and compared. And then the fully coupled aero-hydroservo-elastic model is established in AQWA-OrcaFlex-FAST. In this study, the semi-submersible DeepCwind with NREL 5-MW baseline turbine is selected as reference platform, corresponding 3×2 mooring system is designed. And the coupled aero-hydro-mooring dynamic modeling is studied on.
#Orcaflex oc4 semi submersible series
In the present, a series of numerical simulations of the performances of FOWT are carried out. The mechanical characteristics of a floating offshore wind turbine (FOWT) are very complicated. So, my last question, does the setup procedure above is correct or not? If not, kindly advise the exact method to analyse the dynamic wind only case, before I'm proceeding to analyse the combined dynamic wind-irregular waves.Īttached herewith is the comparison dynamic wind-only case result for your review.Ĭomparison of dynamic wind-only result.jpg (104.A horizontal axis floating wind turbine is mainly composed of power generation, blades, tower, floating foundation, mooring system and power cables. However, I'm still thinking the result is not good enough since the wind input and the procedure was not firm. The result from OrcaFlex Interphase shows that the gap difference between TABLE XIV in that paper is not so big. Wind turbine operating parameters.Ģ) ElastoDyn: Blade (1~3) initial pitch angle also follow as indicated in TABLE VI. Postprocessors with this limitation may not work.", the simulation for dynamic wind-only case run smoothly.ġ) InflowWind: Steady wind type has been used, and the wind input follow as indicated in TABLE VI. Meanwhile in OrcaFlex, there is NPD spectrum been indicated, unfortunately, there is no input for min/max wind speed (only min/max frequency).Īfter made adjustment of the few FAST modules as following below, and the simulation run time is set to 1 hr (3600s), instead of 3 hr (10800) because there is an error stated that "FAST_Init:ValidateInputData:TMax is too large for a 10-character time column in text tabular (time-marching) output files. Is it consider as dynamic wind flow? If yes, then how we want to generate NPD wind file for uniform wind type? Secondly, I noticed that some of InflowWind module is for 12 m/s turbulent winds.
#Orcaflex oc4 semi submersible how to
My first question is, how to setup the NPD wind spectrum? Since NPD was not listed in InflowWind module (only have 5 wind types). For FAST simulation a dynamic wind file was created, by multiplying the recorded hub height wind velocity time history by 0.952 and utilizing a wind shear exponent of 0.0912.
The wind input is based on temporally dynamic NPD wind, which possessed a mean wind speed at hub height of 20.6m/s, a standard deviation of 2.04m/s, a maximum wind speed of 28.7m/s, and a minimum wind speed of 12.9m/s. In that paper, one of cases that have been consider is dynamic wind-only case. I'm trying to validate the results from paper entitled "Validation of a FAST semi-submersible floating wind turbine numerical model with DeepCwind test data", before implement both methods for experimental model soon. Recently, I just started using FAST v8 coupled with OrcaFlex for my research study, focused on OC4 DeepCwind FOWT.
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